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BOV is to prevent compressor surge. Basically what happened is when u shift or start to go from boost to vaccum. The air goes back and stops the turbine from spinning that the flutter you hear. This causes your turbo to go out faster. Yes with more boost the worse this is. I don't run BOV just becuase I like the compressor sound and don't like all the sounds. There are turbos these days made to reduce surge but not 100%
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